Linux

All posts under tag "Linux"

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Configuring DNS over HTTPS (DoH) on OpenWrt

In this short guide, I will explain how to configure name resolution (DNS) over the encrypted HTTPS protocol, also known as DNS over HTTPS (DoH), on a router running OpenWrt.

#dns #linux #open-source #openwrt #cybersecurity #guide

ansible-cmdb - Structuring and Visualizing Ansible Facts

ansible-cmdb is a Python program that structures collected Ansible facts and visualizes them using beautifully formatted HTML.

#ansible #devops #linux #cli #bash #shell #gui #guide

SSH - Port Forwarding: Local and Reverse Tunnels

Today we will look at port forwarding through SSH🔐: how to use local and reverse tunnels to organize access to local and remote services.

#linux #ssh #cybersecurity #howto

Connecting OpenWrt to an OpenConnect Server

In this article we will configure OpenWrt to connect to an OpenConnect server (ocserv) and set up flexible routing: all traffic, only specific domains, or specific IP subnets.

#linux #open-source #openwrt #cybersecurity #vpn #openconnect #guide

Bash: An Example of Optimizing Filtering Commands with grep and awk

I will tell you about a task I solved the other day🧑‍💻 I slightly changed the input data, but the essence remains the same. There are two CSV files: 📄ping_status.csv contains diagnostic information about host availability by ping.

#bash #linux #shell #scripting #howto

Bash: Features of Arithmetic Operations - Increment ((expression++))

When testing the host availability check script I mentioned last time, I encountered an interesting Bash feature when performing arithmetic operations💪.

#bash #linux #shell #scripting #howto

Obsidian — a progressive note-taking tool for PC and smartphone

In this note I'll talk about an application for keeping and structuring notes — Obsidian. We'll install and configure it, connect several plugins: for quickly saving pages from the browser and Telegram posts. We'll also set up cloud sync, so notes are available on all your devices.

#linux #gui #open-source #proprietary #obsidian #guide

Bash: Writing a Universal Host Availability Check Script

Today we'll write a useful Bash script🧑‍💻 that performs various host availability checks on the network🌐. As an example, I'll show how to check connectivity using the `ping` utility🏓 and run a traceroute when it's lost⚡.

#bash #linux #scripting #shell #howto

ShellGPT — an AI assistant in your Linux terminal

In this guide I'll explain how to integrate an AI assistant based on ChatGPT/Gemini/Ollama into your Linux system and interact with it in the terminal using a console application — ShellGPT.